Caffeine Strategies and Fat Oxidation

Enrolling by invitation · Not applicable · Has a placebo group

Conditions studied: Fat Metabolism, Caffeine, Cycling, Exercise, Ergogenics

In brief

The goal of this clinical trial is to learn if different forms of caffeine ingestion can influence fat oxidation during submaximal cycling exercise. The study will recruit healthy adults, both men and women, aged 18 to 50, who regularly perform aerobic exercise. The main questions it aims to answer are: * Does caffeine increase fat oxidation during one hour of cycling at the Fatmax intensity? * Do different forms of caffeine ingestion (capsule, coffee, chewing gum, or mouth rinse) differ in their effect on fat oxidation? * Do these caffeine forms alter total energy expenditure, cardiorespiratory response, or perceived exertion during exercise? * Are there differences in the occurrence or severity of side effects between caffeine administration methods? Researchers will compare each caffeine form to its corresponding placebo to determine their effects on fat oxidation and other physiological outcomes. Participants will: * Attend a pre-experimental session to determine their Fatmax intensity and VO₂max using an incremental cycling test * Perform eight experimental sessions, each consisting of one hour of cycling at Fatmax intensity * Receive caffeine or placebo via capsules, coffee, chewing gum, or mouth rinse according to a randomized, double-blind, crossover design * Be monitored for fat and carbohydrate oxidation, total energy expenditure, heart rate, and perceived exertion during exercise * Report any side effects immediately after the session and 24 hours later using a structured questionnaire All sessions will be conducted under controlled laboratory conditions with standardized protocols to ensure safety and reliable measurements.

Key facts

Study ID

NCT07402902

Run by

Universidad Rey Juan Carlos

People needed

10

Starts

2026-03-15

Expected to finish

2026-09-30

Last updated by the study team

2026-04-29

Who can join

Age: 18 and older, up to 50. Sex: any. Healthy volunteers: accepted.

You may qualify if…

• Healthy men and women aged 18-50 years
• Regular aerobic exercise at least 1 hour per day, 2 days per week
• Provide written informed consent

You may not qualify if…

• Smoking
• Use of medication or ergogenic supplements during the study period
• Caffeine intolerance or allergy
• Cardiopulmonary or musculoskeletal disorders
• Use of oral contraceptives in female participants

Where it is running

• Estadio Raúl González Blanco, Camino del Molino 5 — Fuenlabrada, Madrid, Spain

Full record on ClinicalTrials.gov

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